body {
    background-color: rgb(234,241,241);

}
.add_button{
    height: 50px;
    width: 100px;
    background:-moz-linear-gradient(right,#a1655a,#2e4a53);/*火狐*/
    background:-webkit-gradient(linear, 0% 0%, 0% 100%,from(#b8c4cb), to(#f6f6f8));/*谷歌*/
    background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#fff), to(#0000ff));      /* Safari 4-5, Chrome 1-9*/
    background: -webkit-linear-gradient(right, #a1655a, #2e4a53);   /*Safari5.1 Chrome 10+*/
    background: -o-linear-gradient(right, #a1655a, #2e4a53);  /*Opera 11.10+*/
    border-top-left-radius: 25px;
    border-bottom-left-radius: 25px;
    display: flex;
    align-items: center;
    flex-direction: row-reverse;
    position: fixed;
    right:-50px;
    top:300px;
    cursor: pointer;
    -webkit-transition: right .5s;
    -moz-transition: right .5s;
    -ms-transition: right .5s;
    -o-transition: right .5s;
    transition: right .5s;
}
.add_button img{
    width: 50%;
    transform: rotate(0deg);
    position: relative;
    left:0;
    -webkit-transition: left .5s,transform,.5s;
    -moz-transition: left .5s,transform,.5s;
    -ms-transition: left .5s,transform,.5s;
    -o-transition: left .5s,transform,.5s;
    transition: left .5s,transform,.5s;
}
.form_bg{
    background-color: #000;
    opacity: .5;
    height: 100%;
    width: 100%;
    position: absolute;
    top:0;
}
.add_form{
    justify-content: center;
    display: none;
}
.add_form img{
    width: 50px;
    height: auto;
    position: fixed;
    z-index: 2;
    transform: rotate(45deg);
    right: 37%;
    margin-top: 33px;
}
.add_form form{
    position: fixed;
    z-index: 2;
    text-align: center;
    color: #fff;
    font-size: 20px;
    margin-top: 100px;
    line-height: 55px;
}
table{
    width: 100%;
}
table .id{
    width: 5%;
}
table .title{
    width: 20%;
}
table .author{
    width: 5%;
}
table .summary{
    width: 30%;

}
table .href{
    width: 20%;
}
table tr:first-child{
    background-color: #ddd;
    height: 30px;
    line-height: 30px;
}
table tr{
    text-align: center;
    border-bottom: solid 2px #ddd;
}
table td{
    padding-bottom: 20px;
    padding-top: 20px;
}